Traditional measurements and sizing
One of the most ancient glove making regions is Grenoble in France. In this region, they used the pouce (in other languages: inch, zoll, hüvelyk) as measurement. This length measurement, as most of the measurements at the time, was linked to the emperor’s body. The French pouce was based on the shoe size of Charles the Great. Charles the Great is considered the founding father of France and Germany; sometimes he is even referred to as the father of Europe. He was the first Emperor in Western Europe after the fall of the Roman Empire. One Charles-the-Great-type foot equals 32.484 cm, and it was divided into 12 parts called zolls. These measurements were also used by Hungarian glove makers.
The exact length the same name refers to varies by country:
English inch – 25.40 mm
German zoll – 25.40 mm
Russian inch – 25.41 mm
Wiener zoll – 26.34 mm
French inch – 27.07 mm
The development of 17th century manufacturing, the forming of international markets, and later the industrial revolution each pushed the industry towards the standardization of measurements. The solution was the introduction of the metric system in 1791. However, traditional measuring tools are still in use internally at many workshops.

RARE FRENCH GUNNER'S CALIPERS, c. 1800, signed "Baradelle a Paris," 7-1/2" (19 cm) long (closed), of brass with finely inset steel tips. One side is engraved with a linear scale of (French) inches and twelfths; diagonal lines for "Canon en Bronce:" (using the Spanish spelling of "bronze"!) and calibrated 1, 2, 3, 4, 6, 8, 12, 16, 18, 24, and 36, for direct readout when placing the calipers on the inside diameter of the cannon bore; a circular scale around the hinge, similarly calibrated and labeled "Boulet," for direct readout when placing the calipers on the outside diameter of a cannon ball. The other side has an edge scale of decimeters, centimeters, and millimeters, and diagonal lines for "Canon en Fer." Condition is very fine throughout.

Bigcypress....the 1/16" longer than the English Inch is exactly what I measured and I do think this is absolutely the correct area to be looking . For a brief moment, when I read one of your posted articles, I kinda was starting to check out a different area as one of your posted links mentioned a relation to cannons and there was actually a cannon related implement found along with the rule but I really don't think there is any relation.

Bigcypress....the 1/16" longer than the English Inch is exactly what I measured and I do think this is absolutely the correct area to be looking . For a brief moment, when I read one of your posted articles, I kinda was starting to check out a different area as one of your posted links mentioned a relation to cannons and there was actually a cannon related implement found along with the rule but I really don't think there is any relation.

I thought the cannon link was very interesting and I dont think we have proven what it is yet but Im guessing your rule is early or very early 20th century because of the modern fonts used in the word PARIS. The numbers are old fonts.